Back in high school, I bought this lovely TI calculator. It cost about $80. (That was a lot of money back then! It still is a lot of money now.) In those days, I thought I would grow up to be an engineer. (My brother did.)
The choice was between TI and HP. The latter used some kind of "Reverse Polish Logic" - which I couldn't figure out. The hard-core math types chose those. (My realtor friend Jack uses an HP. They had business models as well as scientific models.)
So yes, it is now in a land fill somewhere near Denver. It broke and it certainly wasn't worth the effort or money to fix it. Besides, I don't have much need for sine and cosine functions these days.